In the mission editor, setting an aircraft's AI to "player" will make it so that when you start the mission you will be playing as that aircraft, right? I have gone to the mission editor, placed an aircraft, waypoints, other allies, enemies, and all that, then set the original aircraft's AI to player. Then I would start the mission and I would be unable to play.
Yes, I have made SURE that I set the AI to "player."